1 #ifndef __NET_IP_TUNNELS_H 2 #define __NET_IP_TUNNELS_H 1 3 4 #include <linux/if_tunnel.h> 5 #include <linux/netdevice.h> 6 #include <linux/skbuff.h> 7 #include <linux/types.h> 8 #include <linux/u64_stats_sync.h> 9 #include <net/dsfield.h> 10 #include <net/gro_cells.h> 11 #include <net/inet_ecn.h> 12 #include <net/ip.h> 13 #include <net/rtnetlink.h> 14 15 #if IS_ENABLED(CONFIG_IPV6) 16 #include <net/ipv6.h> 17 #include <net/ip6_fib.h> 18 #include <net/ip6_route.h> 19 #endif 20 21 /* Keep error state on tunnel for 30 sec */ 22 #define IPTUNNEL_ERR_TIMEO (30*HZ) 23 24 /* 6rd prefix/relay information */ 25 #ifdef CONFIG_IPV6_SIT_6RD 26 struct ip_tunnel_6rd_parm { 27 struct in6_addr prefix; 28 __be32 relay_prefix; 29 u16 prefixlen; 30 u16 relay_prefixlen; 31 }; 32 #endif 33 34 struct ip_tunnel_prl_entry { 35 struct ip_tunnel_prl_entry __rcu *next; 36 __be32 addr; 37 u16 flags; 38 struct rcu_head rcu_head; 39 }; 40 41 struct ip_tunnel { 42 struct ip_tunnel __rcu *next; 43 struct hlist_node hash_node; 44 struct net_device *dev; 45 46 int err_count; /* Number of arrived ICMP errors */ 47 unsigned long err_time; /* Time when the last ICMP error 48 * arrived */ 49 50 /* These four fields used only by GRE */ 51 __u32 i_seqno; /* The last seen seqno */ 52 __u32 o_seqno; /* The last output seqno */ 53 int hlen; /* Precalculated header length */ 54 int mlink; 55 56 struct ip_tunnel_parm parms; 57 58 /* for SIT */ 59 #ifdef CONFIG_IPV6_SIT_6RD 60 struct ip_tunnel_6rd_parm ip6rd; 61 #endif 62 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 63 unsigned int prl_count; /* # of entries in PRL */ 64 int ip_tnl_net_id; 65 struct gro_cells gro_cells; 66 }; 67 68 #define TUNNEL_CSUM __cpu_to_be16(0x01) 69 #define TUNNEL_ROUTING __cpu_to_be16(0x02) 70 #define TUNNEL_KEY __cpu_to_be16(0x04) 71 #define TUNNEL_SEQ __cpu_to_be16(0x08) 72 #define TUNNEL_STRICT __cpu_to_be16(0x10) 73 #define TUNNEL_REC __cpu_to_be16(0x20) 74 #define TUNNEL_VERSION __cpu_to_be16(0x40) 75 #define TUNNEL_NO_KEY __cpu_to_be16(0x80) 76 77 struct tnl_ptk_info { 78 __be16 flags; 79 __be16 proto; 80 __be32 key; 81 __be32 seq; 82 }; 83 84 #define PACKET_RCVD 0 85 #define PACKET_REJECT 1 86 87 #define IP_TNL_HASH_BITS 10 88 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 89 90 struct ip_tunnel_net { 91 struct hlist_head *tunnels; 92 struct net_device *fb_tunnel_dev; 93 }; 94 95 int ip_tunnel_init(struct net_device *dev); 96 void ip_tunnel_uninit(struct net_device *dev); 97 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 98 int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, 99 struct rtnl_link_ops *ops, char *devname); 100 101 void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn); 102 103 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 104 const struct iphdr *tnl_params); 105 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); 106 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 107 108 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 109 struct rtnl_link_stats64 *tot); 110 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 111 int link, __be16 flags, 112 __be32 remote, __be32 local, 113 __be32 key); 114 115 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 116 const struct tnl_ptk_info *tpi, bool log_ecn_error); 117 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 118 struct ip_tunnel_parm *p); 119 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 120 struct ip_tunnel_parm *p); 121 void ip_tunnel_setup(struct net_device *dev, int net_id); 122 123 /* Extract dsfield from inner protocol */ 124 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 125 const struct sk_buff *skb) 126 { 127 if (skb->protocol == htons(ETH_P_IP)) 128 return iph->tos; 129 else if (skb->protocol == htons(ETH_P_IPV6)) 130 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 131 else 132 return 0; 133 } 134 135 /* Propogate ECN bits out */ 136 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 137 const struct sk_buff *skb) 138 { 139 u8 inner = ip_tunnel_get_dsfield(iph, skb); 140 141 return INET_ECN_encapsulate(tos, inner); 142 } 143 144 static inline void tunnel_ip_select_ident(struct sk_buff *skb, 145 const struct iphdr *old_iph, 146 struct dst_entry *dst) 147 { 148 struct iphdr *iph = ip_hdr(skb); 149 150 /* Use inner packet iph-id if possible. */ 151 if (skb->protocol == htons(ETH_P_IP) && old_iph->id) 152 iph->id = old_iph->id; 153 else 154 __ip_select_ident(iph, dst, 155 (skb_shinfo(skb)->gso_segs ?: 1) - 1); 156 } 157 158 static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev) 159 { 160 int err; 161 int pkt_len = skb->len - skb_transport_offset(skb); 162 struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats); 163 164 nf_reset(skb); 165 166 err = ip_local_out(skb); 167 if (likely(net_xmit_eval(err) == 0)) { 168 u64_stats_update_begin(&tstats->syncp); 169 tstats->tx_bytes += pkt_len; 170 tstats->tx_packets++; 171 u64_stats_update_end(&tstats->syncp); 172 } else { 173 dev->stats.tx_errors++; 174 dev->stats.tx_aborted_errors++; 175 } 176 } 177 #endif /* __NET_IP_TUNNELS_H */ 178